 The two largest ethnic groups reported in Kersa were the Oromo (96.25%), and the Amhara (3.65%); all other ethnic groups made up 0.1% of the population.Oromiffa was spoken as a first language by 96.35%, and 3.58% spoke Amharic; the remaining 0.07% spoke all other primary languages reported.The majority of the inhabitants were Muslim, with 96.1% of the population having reported they practiced that belief, while 3.78% of the population said they professed Ethiopian Orthodox Christianity.